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  1. Replies
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    No, its not too late at all. Thank you very much...

    No, its not too late at all.
    Thank you very much for the manual!

    Steve
  2. Just for your information... Before I retired,...

    Just for your information...

    Before I retired, one of my responsibilities as an electrical engineer was protecting my large, wealthy corporation from insurance companies who wanted to blame us for...
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    Roland RT-20 Rotary Ensemble Pedal

    If anyone has a schematic or service manual for a Roland RT-20 pedal, it would be appreciated.

    Thanks,

    Steve
  4. Replies
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    Acoustic Schematic

    Although the power module you have is slightly newer, the attached picture and schematics should help you out.
    Note the power amp schematic (page 3) of the 904/906 mixer. It will be almost identical...
  5. I have easily serviced over 100 Super Reverb...

    I have easily serviced over 100 Super Reverb amps. I have a 1966 SR that is my main playing amp.
    Out of all those amps, I have seen those speakers in maybe 2 or 3 Super Reverbs.
    One of them...
  6. S is a model designation used by Epcos or...

    S is a model designation used by Epcos or Siemens, the manufacturer of the MOV. (Metal-Oxide Varistor)
    20 is the MOV disc size. (20mm)
    130 is the AC voltage at which the MOV will start conducting...
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    I have the service manual, however it is too...

    I have the service manual, however it is too large to post here.
    If you send me a private message with your email address I will send it to you.
    Steve
  8. Replies
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    Service Manual

    I have the service manual for this.
    It is too large to post here (6.7M), however you can send me your email and I will gladly send you a copy.

    Steve
  9. Replies
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    Wow Nick! That looks awesome! Everything found a...

    Wow Nick! That looks awesome! Everything found a great home.
    Steve
  10. Replies
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    More Acoustic Schematics

    Here are some more.

    36816

    Steve
  11. Replies
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    Zipped Acoustic files.

    OK, Here is a bunch. I hope it works. Ignore the title, there are more in there.

    36815

    By the way, I have an awful lot of original replacement parts for Acoustic amps I will probably never use....
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    13,646

    If you send me a PM with your email address I can...

    If you send me a PM with your email address I can give you them.
    They won't work if I repost them.
    Steve
  13. Replies
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    Schematics

    Here are two schematics for the power amp. That is likely where the problem is.
    The output transistors are common 2N3055 devices. Don't worry about the "special" designation on the schematics. The...
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    Univox Schematics

    Here they are.

    36199
    36200

    Steve
  15. Schematic

    Here it is.

    34126

    Steve
  16. Replies
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    This may be helpful for some SMD parts. I cannot...

    This may be helpful for some SMD parts. I cannot speak for its accuracy since I have not used it much.

    33674

    Steve
  17. Replies
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    JX40 Service Manual

    Here you go.

    33663

    Steve
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    TA60CR Service Manual

    Here it is.

    33196

    Steve
  19. Peavey Modifications

    My personal opinion (based on 35 years of experience) is that you will not hear much of a difference in tone. The external op-amp circuitry is really what matters most.
    You may hear a little less...
  20. Thread: JBL PRX 615M

    by Steve L
    Replies
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    2,113

    These should be what you need. 32004 32005...

    These should be what you need.

    32004
    32005
    32006
    32007

    Steve
  21. Thread: Giving up

    by Steve L
    Replies
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    6,214

    Enzo, First, thank you very much for all of...

    Enzo,

    First, thank you very much for all of your insight and generosity in sharing your knowledge over the years. The suggestions you make to people needing help are always spot-on.

    Second,...
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    Studiomaster Schematics

    These may be of some help:

    31292
    31293
    31294
    31295

    Steve
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    Hans, Thank you very much for the schematic. ...

    Hans,

    Thank you very much for the schematic.

    For what it is worth, I have found that most Roland JC amps that have come into my shop have needed to have the potentiometers cleaned in a big way....
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    1983 Manual

    Here is the 1983 (2nd edition) service manual.

    31183

    Please post your 1979 schematic. I don't think I have that one.

    Steve
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    Ruta, These are the values I can see in the...

    Ruta,

    These are the values I can see in the Titan 12 active schematic. I do not have a schematic of the Titan 8. Hopefully it is the same power supply.

    R6 - 10 ohm
    R12 - 47 ohm
    R15 - 100K...
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    Schematic for B215D

    Here is the schematic for the B215D model.
    Maybe it will be close enough.

    30652

    Steve
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    Sorry, I don't have the schematic for that one. ...

    Sorry, I don't have the schematic for that one.

    Steve
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    Service Manual

    Here it is.

    30019

    Steve
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